Mixing machine



F. JOHNSON MIXING MACHINE June 23, 1931.

Filed March 1. 1929 2 Sheets-Sheet l Z9 Francis Jbbnsan ATTORN EYS R O T N E V m ATTORNEYS F. JOHNSON MIXING MACHINE Filed March 1, 1929 2 Sheets-Sheet 2 Francis 1012115011 June 23, 1931.

Patented June 23, 1931 PATE T O FF I C E warmers JOHNSON; or DETROIT, :moHIGAN 1 MIXING 1 MA HINE' Application filedlMarch 1,

The present invention pertains toa novel mixing machine having particular reference to that class of mixingmachine'which is employed for mixing 1 concrete, cement,

powders and the like. 1 1 1 The primary object-of the present invention is to devise a mixing machine which has a plurality of separate "mixing arms and v bladesarranged and designedto give a maximum amount ofagitation to the cement.- or the materials to be mixed. The arms-and blades 1 are specially designed and have a 'resiliency which lessens the likelihood of damage thereto-while in operation and' if -any damage should happen to resultthereto-each arm and blade maybe removedseparatelyfor repairs or for replacements. The blades carried by the arms, being of-a resilient nature, may engage the inner wall ofthe'mixer and the novel arrangement-and-angularity thereof tends. to agitate the substances and to 1 force them toward the door when thearms are 'rotated, andwhen the 'dooris openthe blades will themselves discharge the *mixed =-s'i1b- 5 stances from the mixer. 1

A further object of the present invention iswto construct a-mix-ing machineprovided with theab'ove mentioned features which has a "removable or replaceable bottom. The

friction of the mixing materials and the bladesca-uses aigreat deal of wear in the bot tom 1 of the mixer and when the bottom is made in a casting it must be 'made'quite heavy with this Wear taken into consideration. The expense of the, heavy casting =-is great and the present invention avoids this expense byfacilitating the install'ationof: a sheetmetal bottom which may be inexpensively formed and-which might be replaced several times for the co'sto'f one cast bottom. :With these objects in view and others which *are' subsidiary thereto 1 or resultant therefrom the present invention is fully disclosed in the following"description and the accompanyingdrawings, in which Figure l is a top pla-n view of the mixing machine;

Figure 2 is machine; as Figure 3 is a transverse ocross sect-ional a side; elevation of the mixing View through the mixing machine substantially on the line'33of Figure '2;

1 Figure 4 is across sectional view through one of the blade supporting arms and Figure 5 is a'cross sectional- View through another of the blade supporting arms.

ed, extendsfromend-to end of the mixer-and v is provided with a squared portion 8- intermediate its-eiids 'for -a purpose which will 1 later beoome apparent.

The end members 1 are joined together by a'plurality- (if-members adapted to also support the bottom 9'which is semicircular in crosssection; The upper edges of the bottom rest against the 1 end oining members 11 and 1'2 wl'1ichare bolted to each end asat' 13. The

member 11 is in the form-of an-angle iron sub 7 stantially L-shaped in 1 cross section; The member 12 is substantially L-shaped in cross section and' intermediate its ends it is provided w-ith :an elongated flange 14 which is cut aWay 'at'15 to surround the-opening 16 which accommodates the 'door 17 provided with 1 any suitable" latching-mechanism. The joining member 18 is in the nature of 1 a channel iron which is-slightly concaved toform a seatforthe lowermost'portion of bottomand support the same, the channel member'being joined to theends'l .by bolts-'19.

Side wall members 20 are provided with outwardly extending flanges :"21 through which bolts 22 maybe passed to secure the members 20 .to;' the joining members 11 and 12 and -to. the legs 1. I Theupper-edgesof the members 20: are 1 inturne'd as at' 23' to prevent the materials from splashing "out of the mixer; Themes efthemembers 20 are proads-swat flanges 24 whichaextend'outward1y and to which the end members 25 are secured by bolts 26.

One of the side wall members 20 is provided with an opening 27 in line with the openin s 15 and 16 to accommodate the door 17. Adjacent the opening 27 there are provided flanges 28 which support a spout 29, the spout being connected to the portion 14 on the member 12 by means of the brackets 30 and the bolts 31. In this manner of construction it is obvious that the bottom member 9 is a separate unit which may quite readily be formed of comparatively thin sheet metal. The weight of the bottom 9 is supported by the channel member 18 and is retained in place by the members 11 and 12 upon which the flanges 21 on the members 20 rest.

In order to remove the bottom member 9, it is suflicient merely to detach the retaining member 11 and the supporting member 18, after which the bottom member will fall from the retaining member 12, although with a slight lateral movement due to the curvature of the member 12. If the positioning of the arms 32 and 33 permits, the bottom member 9 may be withdrawn laterally after removal of the member 11 and without removal of the member 18. Another method of removing the bottom member 9 is to detach one of the end supporting members 1, after which the bottom member may be drawn out in its lengthwise direction.

The square portion 8 of the shaft 4 supports a plurality of arms 32 at positions adjacent each end and adjacent each side of the door opening, being arranged in the same relation longitudinally on the shaft but extending in different directions radially. Between the arms 32 are mounted the arms 33, the arms 32 and 33 being clearly illustrated in detail in Figs. 4 and 5. The lower end of the arm 32 is formed with outwardly extending flanges 34 and a right angular groove 35. Bolts 36 secure a strap member 36 to the flanges 34, the strap being formed with a right angular groove that combines with the angular groove 35 to form a square opening which provides the means for mounting the arm 32 upon the shaft 8 by tightening the screws 36' and drawing the strap 36 to tightly embrace the shaft 8 in the square opening. Thearm 32 extends outwardly in a line substantially at right angles to the flanges 34.

The arm 33 is slightly varied in form to that of the arm 32 in that it extends outwardly on a line which is substantially 45 to the flanges 34, the object of which is to provide three arms through an arc of 90. Both arms 32 and 33 are bifurcated as at 39 to support levers 40 which in turn support the curved angularly arranged blades 37. The levers 40 are pivotally mounted in the bifurcation 39 as at 41 and extend beyond the bifurcation to give purchase or leverage whereby the spring 42 contained in the groove 43 when connected to the pin 44 and the end of the lever 39 as at 45 will move the lever 40 until the blades 37 contact with the inner wall of the mixer.

The arms are arranged on the shaft so that the arms 32 are adjacent the ends of the mixer and the door opening and an arm 33 is attached between each pair of arms 32. In the drawings there is illustrated a separate set on each side of the door, the sets on opposite sides of the door being mounted on opposite sides of the shaft and having the blades 37 inclined at opposite angles. The arms project radially from the shaft 8 at an angle of 45 to each other and therefore the blades 37 combine and have like effect of an Archimedean screw. The blades being oppositely inclined on opposite sides of the door has the effect of two oppositely directed Archimedean screws which tend to propel the mixing materials back and forth in the mixer. The. blades being arranged thus throw the material against the door and when the door has been opened the blades will empty the mixer by continuing the rotation thereof.

Although a specific embodiment of the present invention has been illustrated and described it is to be understood that various alterations may be made in the details of construction without departing from the spirit of the invention as defined by the scope of the appended claims:

What I claim is 1. In a mixing machine, side and end members forming an enclosure open at its top and bottom, parallel retaining members attached to the lower edges of said side members, one of said retaining members being detachable, a bottom member at the bottom of said enclosure between said retaining members and abutting said retaining members, and a supporting member on which said bottom member rests, said supporting member being spaced from said detachable retaining member to permit withdrawal of the bottom mem her in a direction transverse of said enclosure, 311 removal of said detachable retaining mem- 2. In a mixing machine, side and end members forming an enclosure open at its top and bottom, supporting means at the lower edges of said end members, parallel retaining members attached. to the lower edges of said side members, one of said retaining members being detachable, a concave bottom member at the bottom of said enclosure between said retaining members and abutting said retaining members, said bottom member having its ends closed by said supporting means, a supporting member on which said bottom member rests, said supporting member being spaced from said de tachable retaining member and said supporting means being spaced apart to permit withdrawa-l of the bottom member in a direction by said bottom member may be withdrawn transverse of said enclosure, on removal of lengthwise after removal of the detachable said detachable retaining member.

3. In a mixing machine, side and end members forming an enclosure open at its top and bottom, parallel retaining members attached to the lower edges of said side members, and retracted outwardly from the inner walls of said side members, one of said retaining members being detachable, a bottom member at the bottom of said enclosure between said retaining members and in engagement therewith and abutting upwardly against said side members, and a supporting member on which said bottom member rests, said supporting member being spaced from said detachable retaining member to permit withdrawal of the bottom member in a direction transverse of said enclosure, 'on {)emoval of said detachable retaining mem- 4. In a mixing machine, side and end members forming an enclosure open at its top and bottom, parallel retaining members attached to the lower edges of said side mem bers, one of said retainingmembers being detachable, and the other retaining member having a curved frame portion adapted to define a door opening, a curved bottom member at the bottom of said enclosure resting partly on the last named retaining member and engaged outwardly by said detachable retaining member, and a supporting member on which said bottom member rests, said supporting member being spaced from said dotachable retaining member topermit withdrawal of the bottom member-in a direction transverse of said enclosure, on removal of said detachable retaining member.

5. In a mixing machine, side and end members forming an enclosure open at its top and bottom, parallel retaining members attached to the lower edges of said side members, one of said retaining members being detachable, a bottom member at the bottom of said enclosure between said retaining members and abutting said retaining members, and a detachable supporting member on which said bottom member rests, whereby said bottom member may be removed by detachment of said supporting member and the detachable retaining member.

6. In a mixing machine, side and end members forming an enclosure open at its top and bottom, supporting means at the lower edges of said end members, parallel retaining members attached to the. lower edges of said side members, a concave bottom member at the bottom of said enclosure between said retaining members and abutting said retaining members, said bottom member having its ends closed by said supporting means, a support- 7 ing member on which said bottom member rests the supporting means at one end of said bottom member beingdetachable, wheresupporting means. In testimony whereof I afiix my signature.

FRANCIS JOHNSON. 

